Effect of compost on rhizosphere microflora of the tomato and on the incidence of plant growth-promoting rhizobacteria.

Applied and Environmental Microbiology
A M de BritoH Antoun

Abstract

Four commercial composts were added to soil to study their effect on plant growth, total rhizosphere microflora, and incidence of plant growth-promoting rhizobacteria (PGPR) in the rhizosphere of tomato plants. Three of the compost treatments significantly improved plant growth, while one compost treatment significantly depressed it. Compost amendments caused only small variations in the total numbers of bacteria, actinomycetes, and fungi in the rhizosphere of tomato plants. A total of 709 bacteria were isolated from the four compost treatments and the soil control to determine the percentage of PGPR in each treatment. The PGPR tests measured antagonism to soilborne root pathogens, production of indoleacetic acid, cyanide, and siderophores, phosphate solubilization, and intrinsic resistance to antibiotics. Our results show that the addition of some composts to soil increased the incidence in the tomato rhizosphere of bacteria exhibiting antagonism towards Fusarium oxysporum f. sp. radicis-lycopersici, Pyrenochaeta lycopersici, Pythium ultimum, and Rhizoctonia solani. The antagonistic effects observed were associated with marked increases in the percentage of siderophore producers. No significant differences were observed in the...Continue Reading

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Citations

Aug 24, 2006·Pest Management Science·Ana PiedrabuenaAntonio Bello
Aug 8, 2012·World Journal of Microbiology & Biotechnology·Vidhi ChaudharyAshok Kumar Bhatnagar
Oct 6, 1998·Applied and Environmental Microbiology·K NakasakiH Nagata
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Mar 10, 2016·Environmental Science and Pollution Research International·Shivika DattaJaswinder Singh
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Dec 23, 2019·Microbiological Research·René CarlsonNico Labuschagne
Oct 27, 2010·Journal of Hazardous Materials·Jin Hee ParkJae-Woo Chung

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